Angular Momentum, Parametric Oscillator and Over Unity

[arhitrade]

Parametric resonance of the second kind in an RL circuit. Criteria for over-unity. Calculation method

[kolbacict]

Here is a device for modulating the magnetic permeability of the core. For your second type of parametric resonance. 
There is no inductive coupling between the windings.

[citfta]

I have done an analysis on paper and to my surprise the forces cause the velocity to reduce. Your formula is when you blindly assume conservation of angular momentum holds which can only be proven by experimental data to end discussion. There are 2 cases:

Angular momentum is conserved thus kinetic energy is gained
Angular momentum is not conserved, due to "outside" influence, but energy is conserved

I think you can agree that forming a conclusion on an unmeasured quantity is not very scientific.

Hi broli,


The conservation of angular momentum is a proven FACT.  I am not sure why you believe kinetic energy is gained.  I am sure you have seen this law at work many times.  If you have ever watched a figure skater do a spin, they start a slow spin and then pull their arms in tight to their body while also bringing their legs as close together as they can.  When they do this their rotational speed increases greatly.  You can try this for yourself.  Find an office chair or stool that spins easily.  Sit in it with your arms and legs spread out as far as you can get them.  Have someone give you a spin.  Now pull your arms and legs in as close to the center of rotation as you can.  You WILL feel your speed of rotation increase quite a bit.  When you extend your arms and legs you will also feel your speed slow down just like the figure skater at the end of her spin when she suddenly throws her arms and one leg out to stop her spin.  If you chair is very easy to turn you can repeat that process a few times before the spinning gets too low to feel the effect.


Carroll